Boundaries and Recesses of the Lesser and Greater Sac

The lesser sac, also known as the omental bursa, and the greater sac form the peritoneal cavity’s two major divisions. The lesser sac is located posterior to the stomach and the liver, while the greater sac comprises the primary peritoneal cavity.

Clinical Conditions Related to the Lesser and Greater Sac

Abscess Formation

Abscesses in the lesser sac typically arise due to perforation of the posterior stomach wall, pancreatitis-related infections, or post-surgical complications.

Herniation

The lesser sac can be involved in internal hernias, particularly through the foramen of Winslow, leading to intestinal obstruction.

Surgical Considerations

Accessing the lesser sac requires careful navigation through the lesser omentum. Knowledge of these anatomical boundaries is crucial for procedures like pancreatic surgery.